bush and wife laura joining president obama and first lady. the group is part of a long list of american and international dignitaries, one that includes former presidents clinton and carter on hand for a massive public memorial tomorrow with a crowd of nearly 100,000 expected to attend. nbc's ron aless than is live in soweto, south africa with more. ron, we learned today president obama will be speaking tomorrow. what can we expect to hear at that address? >> well, i would imagine his remarks will be very personal. as you know, he has a very close relationship with nelson mand a mandela. their lives are intertwined. mr. obama has said that his first political act as an individual was in support oh of the anti apartheid movement, which mr. mandela, of course, was leading. so there's that. we expect that this could be one of the largest gatherings of heads of states ever together assembled in one place. it's an event that will perhaps rival the funeral of pope john paul ii back in 2005. some 3 million converged upon the vatican. the numbers her